Sharon Osbourne (C), pictured with Sara Gilbert (L) and Aisha Tyler, shared a story on “The Late Late Show with James Corden” while discussing her role as manager to Ozzy Osbourne. File Photo by Christine Chew/UPI | License Photo

“Yes, because he wouldn’t pay us the full money,” Osbourne explained after host James Corden asked her about the incident.

“He was trying to say, ‘Oh, we spent this on advertising’ — he didn’t. The show sold out in one day and he had, like, a month’s worth of advertising bills. I’m like, come on,” she recalled. “He wouldn’t give us that money, so I just stood up and headbutted him.”

Osbourne has managed Ozzy, a singer and the frontman of the band Black Sabbath, since the 1970s. She was one of the few female talent managers when she got her start, leading her to adopt a particularly “crass” persona.

“I was kind of very mean and crass. I was really crass. You think I’m crass now?” the star said. “I would just go in there and be like … ‘Don’t mess with me!'”

“I mean, really, it was a kind of protection,” she explained. “It was a shield, because half the time i didn’t know what I was doing. But I thought if you act a bit nuts, people will be wary of you.”